Recording and reproducing device and method



Nov. 18, 1941. CLOPTON 2,263,485

RECORDING AND REPRODUCING DEVICE AND METHOD Filed Aug. I4, 1940 2 Sheets-Sheet 1 l I i I 1 VI 5 I 8 ml! I Y -za g 1 E I! 2 3 1 v, 1a

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J l 23 v 9' 1 v Inventor /4/,lan der- C/a) fan I By Mania A Barney,

Nov. 18, 1941. A. B. CLOPTON 2,263,485

RECORDING AND REPRODUCING DEVICE AND METHOD Filed Aug. 14, 1940 2 Sheets-Sheet? v Inventor I fl/examde (Va 0 .1.

.9' 6 J0 r 9 7 By Aiiorney I Patented Nov. 18, 1941 UNITED STATES PATENT OFFICE macoanmc AND nnraonucmc DEVICE AND mz'rnon Alexander 13.01am, Enid, Okla. Application August 14, 1940, Serial No. 352,638

' (c1. ire-100.2)

4 Claims.

- magnetic impulses are concentrated and confined to a smaller area of the wire or tape, so that the recording and reproduction is more free of noise and imperfections, and a shorter length of wire or tape is required for a given record thereon.

Other important objects and advantages of the invention will be apparent from a reading of the following description taken in connection with the appended drawings, wherein for purposes of illustration I have shown a preferred embodiment of my invention.

In the drawings- Figure 1 is a general side elevational view of the embodiment.

Figure 2 is a longitudinal vertical sectional' the core.

Figure 8 is a top plan view of Figure '7.

Figure 9 is an enlarged fragmentary transverse vertical sectional view with the concentrated magnetic flux illustrated in phantom lines with respect to the tape or wire and the core and surrounding elements.

Figure 10 is a perspective. view of a wire with respect to which the recording and reproduction may be carried on.

In accordance with the present invention the magnetic impulses used to afi'ect the steel wire or tape for the purposes of the invention, are concentrated in a compartively small cross section pencil so that they will occupy as little space as possible so that the recording may be made at a slower wire or tape speed, with consequent reduction of unwanted noises in,the reproduction.

The apparatus shown in the drawings comprises the U-shaped .core 5 which is in the present embodiment, rectangular in cross section and composed of the bight portion 6, the opposed vertical legs 1 and 8, respectively, and the pyramidi-,

cal terminal portions 9 and II), respectively, on the upper ends of the 'legs which lean toward each other as illustrated in Figures 2 and 9 with their points close together. The bight portion 6 has a suitable winding ll thereon which extends between the uprights and 8, this winding having one end thereof connected to the binding post l2 and the other end thereof connected to the binding post I3, a suitable source of alternating current being connectible to the said binding posts to set up the necessary alternating magnetic flux in the core 5.

Between the points 9 and H) of the core and conforming to the space therebetween and above the winding II is the block l2 of metallic conductive but non-magnetic material which is insulated as indicated by the numerals l3 and M from the inner surfaces of the points 9 and H! as clearly shown in Figure 9 of the drawings, with the apex l5 of the body I2 located slightly above the materials of the points 9 and ill. The

block [2 merges into a heavy disk-shape [6 which has square openings l1 and I8 to accept the arms I and 8 of the core, with insulating material l9 and 20', respectively, completely insulating the core from the said openings. In addition, the disk form I6 is slotted at the diametrically opposed points 2| and 22, aligned with the.

legs of the core, these slots receiving insulation as indicated by the numerals 23 and 24, respec tively. The gaps provided by the insulation material containing slots 2| and 22 are provided to prevent shorted turns of conducting material around the core; The periphery 25 of the disk form I6 is indicated by the numeral 21 and this insulating material extends 'in a frustro-conical form as indicated by the numeral 21 to cover the top of the disk-like form and the tops or radially outward sides of the points 9 and [0 of the core 5. The insulation 21 is interrupted over the point l5 of the body l2 as shown in Figure 9 to provide an aperturearound the point l5. Above the block l2 and disk form [6 is the annular block 28 which is formed of conductive but non-magnetic material. The underside of the block 28 conformably fits the frustro-conical shaped insulation 21 and has a convex rounded top 29 and has a downwardly flaring opening 30 at its center which registers in concentrically spaced relation with the point IS. The opening 30 is that overwhich the steel wire or steel tape 3| is drawn to receive the concentrated magnetic impulses produced by energization of the core 5. The top 29 of the block 28 has a groove 32 formed therein to guide the wire or tape 3| as indicated in Figure 3 or may be provided on this area with wear resisting material. Hinged at the point indicated by the numeral 33 at one side of the path 32 is the conductive non-magnetic material disk 34 which has a relatively small hole 35 at its center which is registered with the wire or tape 3| and with the opening ll. The disk I is formed and arranged to concentrate the magnetic impulses on the wire or tape ii. The casing 26 is arranged as a shield for the entire device and may be of either magnetic or nonmagnetic material.

In the arrangement and operation of the device described, advantage is taken of' the existence of eddy currents and their demagnetizing eilfect. When an alternating current is passed through the coil H a varying and alternating magnetic flux is set up in the core 5. At the points 9 and ID the flux will not readily pass through the block I! and disk form It because of the eddy currents produced in the block and disk form. Instead the varying part of the fiux is directed toward the block 28 overlying the point of the core. Because of the action of the eddy currents, the body 28 tends to concentrate the pulsating parts of the flux into the small opening 30 in the center of this body, the disk 34 heightening and confining the concentration thus produced to a relatively small area or cross section of the record wire or tape 3| which overlies the opening 30 in any direction.

It is obvious that for reproducing from a record wire or tape, the arrangement described may be connected to the input of a suitable amplifier and the wire drawn past the opening 30, so that the passage of the wire ortape will induce currents in the winding of the core. I

Although I have shown and described herein a preferred embodiment of my invention, it is to be definitely understood that I do not wish to limit the application of the invention, except as may be required by the scope of the subjoined claims. 1

Having described the invention, what is claimed as new is:

1.'A recording and reproducing device of the character described, said device comprising a U-shaped core having a winding thereon, said core having laterally inwardly deflected tapered terminals on its legs terminating in relatively closely spaced small points, a non-magnetic conductive block surrounding and extending between said terminals and insulated therefrom, said block being formed with flux pencil forming opening above said points and of relatively small size.

character described, said device comprising a U- 2. A recording and reproducing device of the second non-magnetic conductive material block overlying and insulated from the first mentioned block, said second block being formed with a second flux pencil forming opening registered with the first-mentioned flux pencil forming opening and across which the wire or tape to be impressed is drawn;

3. A recording and reproducing device of the v character described, said device comprising a U- shaped core having a winding thereon, said core having laterally inwardly deflected tapered terminals on its legs terminating in relatively closely spaced small points, a non-magnetic conductive block surrounding and extending between said terminals and insulated therefrom, said block being formed with flux pencil forming opening above said points and of relatively small size, a second non-magnetic conductive material block overlying and insulated from the first mentioned block, said second block being formed with a second fiux pencil forming opening registered with the first mentioned flux pencil forming opening and across which the wire or tape to be impressed is drawn, and a flux confining and concentrating body of non-magnetic conductive material overlying the said second block and said wire or tape, said body being formed with an opening registrable with saidsec- 0nd flux pencil forming opening.

4. A recording and reproducing device of the character described, said device comprising a U- shaped core having a winding thereon, said core having laterally inwardly deflected tapered terminals on its legs terminating in relatively closely spaced small points, a non-magnetic conductive block surrounding and extending between said terminals and insulated therefrom, said block being formed with flux pencil forming opening above said points and of relatively small size, a. second non-magnetic conductive material block overlying and insulated from the first mentioned block, said second block being formed with a second flux pencil forming opening registered with the first-mentioned flux pencil forming opening and across which the wire or tape to be impressed is drawn, and a flux confining and concentrating body of non-magnetic conductive material overlying the said second block and said wire or tape, said body being formed 'with an opening registrable with said second flux pencil forming opening, and a shielding container enclosing said core, saidwinding, and the first and second blocks.

ALEXANDER B; CLOP'I'ON. 

